GLP-1 Medications and Your Eyes: What You Need To Know

Medications like semaglutide (Wegovy/Ozempic) are transforming how we treat diabetes and support weight loss. They can lead to significant weight reduction and improve overall health, including lowering the risk of heart disease and stroke. But like any powerful treatment, there are a few things to be aware of, especially when it comes to your eye health.

GLP-1 medications and diabetes

GLP-1 medications improve blood sugar levels, sometimes quite quickly. While this is beneficial overall, rapid changes in blood sugar can temporarily affect the small blood vessels in the retina (the back of the eye). This is not because the medication is directly toxic to the eye, but rather due to how quickly the body is adjusting.

If you have diabetes and you would like to start a GLP-1 medication make sure that your retinal eye screening is up to date (within the last year). This is especially important if you have had diabetes for a long time, your blood sugars have been high, or if you already have known eye disease.

In the first few months there is a small risk that diabetic retinopathy may temporarily worsen. The risk is higher if you already have diabetic eye disease, if your HbA1c drops quickly, or if you have longstanding diabetes. It is important that you attend all scheduled retinal screening appointments. Your doctor may recommend closer follow up (every 3 – 6 months) early on if you are higher risk. Sometimes a slower dose increase is used to reduce risk.

GLP-1 medications and other eye risks

The risk to the eyes is very low with these medications, but a few rare conditions have been reported. These include optic nerve stroke (non arteritic ischaemic optic neuropathy), which presents with sudden loss of vision or blur in one eye. There have also been reports of increased risk of wet age-related macular degeneration which may present with distortion or blurring of the central vision. It is important to emphasise that these are very uncommon, and the overall benefits of treatment are usually much greater than the risks.

Summary

GLP-1 medications are highly effective and increasingly important in modern health care. To use them safely we recommend you

• Have regular eye checks (especially if you have diabetes)
• Report any visual changes early
• Go slowly with dose increases if you are higher risk

With the right precautions we can protect vision while still gaining the significant health benefits these medications provide.